feat(ui): add a bunch of tests

packages/ui/src/lib/inputs/InputVec3.svelte.ts

@@ -0,0 +1,26 @@
+import { describe, expect, it } from 'vitest';
+import { render } from 'vitest-browser-svelte';
+import { page } from 'vitest/browser';
+import InputVec3 from './InputVec3.svelte';
+
+describe('InputVec3', () => {
+  it('should render with correct initial values', async () => {
+    const value = $state([1.5, 2.5, 3.5]);
+    render(InputVec3, { value });
+
+    const inputs = page.getByRole('spinbutton');
+    await expect.element(inputs.first()).toBeInTheDocument();
+
+    expect(inputs.nth(0)).toHaveValue(1.5);
+    expect(inputs.nth(1)).toHaveValue(2.5);
+    expect(inputs.nth(2)).toHaveValue(3.5);
+  });
+
+  it('should have step attribute', async () => {
+    const value = $state([0, 0, 0]);
+    render(InputVec3, { value });
+
+    const input = page.getByRole('spinbutton').first();
+    await expect.element(input).toHaveAttribute('step', '0.01');
+  });
+});